Bluelab OnePen™

One pen. Three measurements. Everything you need to know about your reservoir, in your hand, right now. The Bluelab OnePen measures pH, conductivity, and temperature simultaneously and displays pH and EC on screen at the same time, so there is no switching between readings, no second instrument to carry, and no guesswork about whether the readings you are comparing were taken from the same moment.

At 0.01 pH resolution, the OnePen sits at the precise end of what handheld instruments can achieve, and the replaceable probe takes away the usual anxiety around when a probe has degraded too far to trust. The integrated probe health indicator tells you directly, removing the guesswork entirely. When it is time to replace, the probe swaps in seconds without tools.

Connect via Bluetooth to the Edenic app and the OnePen becomes part of something bigger: real-time data visible remotely via app or browser, shareable with your team, with software updates delivered directly to the pen over time. For growers who want one premium instrument that does everything cleanly and connects seamlessly to the broader monitoring ecosystem, the OnePen is it. Conductivity selectable in EC, CF, PPM 500, or PPM 700. Temperature in °C or °F. IP68 dust and waterproof rated. Ergonomic build with high-contrast backlit display.